I subbed for two years between permanent posts, and I can tell you the exact moment a sub day is won or lost: it’s the first four minutes, while you’re still hunting for the whiteboard pens and the class is conducting its ancient ritual of Testing the Substitute. Whatever you establish in those minutes is your ceiling for the day.

The single best thing I did in my subbing years was stop depending on whatever I found in the room. Instead I carried my own classroom — one saved Boardee board that runs in any browser, no install, no IT ticket — and had it on the projector before most of the class had found their seats. Here’s the exact board, the routines it powers, and the honest limits.

Why a browser board is the sub’s superpower

Every classroom’s tech is different; every classroom’s browser is the same. Boardee needs no login to use — a board saves on whatever device you build it on — but the free account matters enormously for subs specifically: sign in on the classroom machine and the board you built at home appears exactly as you left it. Thirty schools, one board.

That consistency is the point. Regular teachers get to build routines over months. A sub gets four minutes. Carrying the same tools into every room means you have routines even when the class doesn’t know them yet — and a class can learn “when the timer’s up, we’re done” in one demonstration.

Timetable — top corner, filled in from the teacher’s notes before the bell if I can, during register if I can’t. This is the highest-value five minutes of a sub’s morning. A class that can see the plan for the day relaxes measurably, and it neutralises the classic sub-day gambit — “we normally have golden time now” — because the schedule is public and I can say “show me where.” The timetable takes the argument so I don’t have to.

Timer — the workhorse. Every task the teacher left gets a visible countdown: “Fifteen minutes for this sheet — beat the timer.” Time-boxing a stranger’s lesson plan does two things: it creates urgency I have no relationship-capital to create personally, and it paces the day so I don’t hit 2:30 with either forty spare minutes or half the work undone.

Noise meter — my secret weapon, deployed after lunch without fail. I introduce it as a game: “This meter listens to the room. Keep the level under the line until the timer ends, and the last ten minutes are game time.” The class polices its own volume — genuinely, they shush each other — and I get to spend the afternoon not being the stranger who shushes. For a sub, who has no goodwill bank to draw on, outsourcing enforcement to a widget is worth its weight in gold stars.

Name picker — solves the two questions that eat sub days: “who should answer?” and “that’s not fair.” I ask a sensible-looking child to read me the register while I type the names in — two minutes — and from then on the wheel hands out questions, jobs, and lining-up order. Randomness is a sub’s best friend: it’s fair, it’s visibly fair, and it requires zero knowledge of the class politics I can’t possibly know.

Traffic light — my signal system, explained once at 8:50: “Green, work as normal. Amber, finish your sentence and look this way. Red, stop, silent, eyes on me.” One demonstration, and I have a whole-class attention signal that doesn’t depend on knowing the school’s clap-pattern or magic word. (Every school has one. You will never be taught it.)

Sticky note — two on the board all day: one with my name (spelled correctly, ending the “Miss… Whatsit?” era), one as the visible “parking lot” where I write things I’ve promised to deal with later. Kids trust a promise they can see. It also becomes my end-of-day note for the returning teacher.

The two routines that carry the day

The opening ninety seconds. Board up before the bell if humanly possible. Timetable visible, name note posted, timer showing the first task’s minutes before I’ve said a word. The message this sends — this person has systems — does more for the day than anything I could say aloud. Classes test improvisers; they mostly don’t test the visibly organised.

The reserve tank. Sub plans run short. Not sometimes — usually, because teachers write plans generously and classes work fast for novelty. My reserve is three projected games that need zero prep and no student devices: Snowman with words from the classroom’s own wall displays (instant relevance, zero planning), whole-class Tic Tac Toe where a team must answer a review question to claim a square, and a topic word search — type the class’s current topic and the AI fills the grid in under a minute. Fifteen spare minutes stops being a hazard and becomes the reward the noise meter was promising all afternoon.

Honest limits

The board is scaffolding, not a substitute for the actual craft — the calm voice, the proximity, the choosing of battles. A rough class is still a rough class; the widgets just mean your energy goes into the humans instead of into being a human timer, human volume monitor, and human random-number generator simultaneously.

Also: check the projector situation first, before you plan the day around it. Rooms without working projection exist (I kept a low-tech fallback in my bag for exactly this), and occasionally you’ll meet a locked-down machine where even the browser fights you. It happened to me maybe one day in twenty — annoying, survivable, plan for it.

And a small courtesy that pays forward: leave a line in your note saying what you used. “Ran your Tuesday plan with visible timers; class earned game time at 2:45 via a noise-meter deal” tells the returning teacher exactly what deals were struck in their kingdom. Teachers remember subs who leave the kingdom tidy — and those are the subs who get requested back.

Build it tonight

Twenty minutes, honestly: open boardee.app, drag on the six widgets above, arrange them once, and make a free account so the board follows you. Tomorrow, you walk into a room you’ve never seen, sign in, and — alone among everyone in that building — you’re teaching in your own classroom.

Mentioned in this post — all on the same free board: